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Aspect Ratio Calculator — 16:9, 4:3, 1:1 & Custom

Resize an image or video while keeping the aspect ratio. Type either width or height — the other fills automatically.

Original

Aspect ratio: 16:9

New size (preserves ratio)

Type either dimension — the other fills automatically.

16:9
About this tool

Stop squishing images

If you change the width without recalculating the height, your image gets stretched. This tool keeps the aspect ratio locked. One-click presets for 16:9, 4:3, 1:1, 9:16 (Reels), 21:9 (cinematic) and 3:2 (DSLR photo).

How to use the Aspect Ratio Calculator

Takes about a minute. No signup, no download, your data stays in your browser.

  1. 1
    Open the tool. Scroll up to the Aspect Ratio Calculator above — it loads instantly in your browser, no install needed.
  2. 2
    Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
  3. 3
    Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.

Frequently asked questions

Common questions about the Aspect Ratio Calculator.

Is the Aspect Ratio Calculator free to use?

Yes. The Aspect Ratio Calculatoron 7BusyBoss is completely free — no signup, no paywall, no usage cap. We do recommend paid alternatives in a sidebar card, but the core tool stays free.

Do I need to sign up to use the Aspect Ratio Calculator?

No. The Aspect Ratio Calculatorworks instantly in your browser — no account needed. Signing in with Google is optional and only unlocks features like saving favorites and higher AI build limits.

Does the Aspect Ratio Calculator work on mobile?

Yes. Every tool on 7BusyBoss is mobile-responsive and works in any modern browser — Chrome, Safari, Firefox, Edge — on phones, tablets and desktops.

Is my data safe when I use the Aspect Ratio Calculator?

Yes. The Aspect Ratio Calculatorruns entirely in your browser — your inputs never leave your device unless the tool explicitly fetches public data (e.g. currency rates). We don't store the values you type.

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